Shoe having an inflatable bladder

ABSTRACT

An article of footwear including a sole and an upper with an exterior and interior surface, and one or more bladders which comprises at least one of the exterior or interior surfaces of the upper. The bladder comprising sheets of polyurethane or polyester film attached together to form an airtight seal. The article of footwear also includes a inflation mechanism for selectively introducing air in the one or more bladders. The inflation mechanism is located under the foot of the wearer to be activated by the normal action of the wearer to inflate the one or more bladders. The article of footwear may also include an assembly for connecting several tubes to one under foot inflation mechanism. The article of footwear may also include inflatable laces that are inflated by an underfoot inflation mechanism.

This application is a CIP of 10/186,717 filed Jul. 2, 2002, now U.S.Pat. No. 6,785,985.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to footwear, and more particularly to an athleticshoe having an inflatable bladder.

2. Background Art

Athletic footwear must provide stable and comfortable support for thebody while subject to various types of stress. It is important that theshoe be comfortable and provide support during various foot movementsassociated with athletic activity.

Articles of footwear typically include an upper and a sole, and are soldin a variety of sizes according to the length and width of the foot.However, even feet of similar length do not have the same geometry.Therefore, a conventional upper must be adjustable to provide support tovarious foot contours. Many different products and designs have focusedon the need for adjustable upper support. For example, the upper mayinclude an ankle portion which encompasses a portion of the ankle regionof the foot and thereby provides support thereto.

In addition, it is well known to adjust the size of a shoe throughlacing or through one or more straps reaching across the throat of atypical shoe. Lacing alone, however, suffers from several disadvantages,for example, when the shoe laces or strap is drawn too tightly, thefastening system can cause pressure on the instep of the foot. Suchlocalized pressure is uncomfortable to the wearer and can make itdifficult for the shoe to be worn for prolonged periods of time.Furthermore, while lacing allows the upper of the shoe to be adjustableto accommodate varying foot and ankle configurations, it does not moldthe shoe to the contour of individual feet. Moreover, there are areas ofthe foot which are not supported by the upper, due to the irregularcontour of the foot. The ski boot industry has often resorted to usinginflatable insertable devices to improve the fit of the boots withoutthe pressure caused by lacing.

One of the problems associated with shoes has always been striking abalance between support and cushioning. Throughout the course of anaverage day, the feet and legs of an individual are subjected tosubstantial impact forces. Running, jumping, walking and even standingexert forces upon the feet and legs of an individual which can lead tosoreness, fatigue, and injury.

The human foot is a complex and remarkable piece of machinery, capableof withstanding and dissipating many impact forces. The natural paddingof fat at the heel and forefoot, as well as the flexibility of the arch,help to cushion the foot. An athlete's stride is partly the result ofenergy which is stored in the flexible tissues of the foot. For example,during a typical walking or running stride, the achilleas tendon and thearch stretch and contract, storing energy in the tendons and ligaments.When the restrictive pressure on these elements is released, the storedenergy is also released, thereby reducing the burden which must beassumed by the muscles.

Although the human foot possesses natural cushioning and reboundingcharacteristics, the foot alone is incapable of effectively overcomingmany of the forces encountered during athletic activity. Unless anindividual is wearing shoes which provide proper cushioning and support,the soreness and fatigue associated with athletic activity is moreacute, and its onset accelerated. This results in discomfort for thewearer which diminishes the incentive for further athletic activity.Equally important, inadequately cushioned footwear can lead to injuriessuch as blisters, muscle, tendon and ligament damage, and bone stressfractures. Improper footwear can also lead to other ailments, includingback pain.

In light of the above, numerous attempts have been made over the yearsto incorporate into a shoe a means for providing improved cushioning andresiliency to the shoe. For example, attempts have been made to enhancethe natural elasticity and energy return of the foot with foams such asEVA, which tend to break down over time and lose their resiliency, orwith fluid-filled inserts. Fluid filled devices attempt to enhancecushioning and energy return by containing pressurized fluid disposedadjacent the heel and forefoot areas of a shoe. Several overridingproblems exist with these devices.

One of these problems is that often fluid filled devices are notadjustable for physiological variances between people and the variety ofactivities for which athletic shoes are worn. It has been known toadjust fluids in the sole of footwear, such as in U.S. Pat. No.4,610,099 to Signori. However, under foot devices, while providingcushioning to the sole, typically do not aid in support for the sides,top and back of the foot. Attempts to cushion the upper and sole of ashoe with pressurized air have resulted in products that are eitherineffective or, because of the construction techniques used, are tooheavy and cumbersome to be used for a running shoe.

In some conventional underfoot cushioning systems, the underfoot portionof an inflatable bladder is typically separate from the portions of aninflatable bladder along the sides and top of the foot. Thus, downwardpressure in the heel of a conventional cushioning device has no effecton the cushioning surrounding the sides and heel of a foot. Further,conventional inflatable shoe inserts are also designed to be used inconjunction with a conventional shoe upper. A shoe with this type ofdesign can be quite expensive because it requires all the materials ofthe upper and the additional materials of the inflatable insert. Oftenthe inflatable inserts also add bulk to the shoe because they require asystem of complex tubing between the inflation mechanism and theinflatable bladder hidden within several layers of upper padding andmaterial.

Most conventional inflatable shoes include either a hand-held inflationmechanism, e.g., that described in Brazilian Patent No. 8305004 toSignori, or an on-board inflation mechanism which is used to selectivelyinflate only a portion of a shoe. Other inflatable shoes arepre-inflated at the factory. Whether inflated at the factory or inflatedby the user, there is a problem with diffusion of air out of the shoe.In the case of shoes inflated at the factory, the problem of diffusionhas been partially solved by utilizing a large molecule gas as the fluidfor inflating the shoe. While the large molecule gas does not diffuse atthe same rate as air, the gas is more expensive which increases thecosts of the shoe, and a user is not capable of varying the amount ofpressure in the shoe to his individual preferences. Nonetheless, oneproblem associated with inflation devices in shoes is how to bleedexcess air out of an inflated bladder to avoid overinflation.

It is also well known to use an inflatable bladder in the upper of ashoe to accommodate the variation in foot shape. The assignee of thepresent invention, Reebok International Ltd., popularized such a shoewith its introduction of “The Pump” in the late 1980's, described inU.S. Pat. No. 5,158,767 and incorporated herein by reference. Also inthe mid-1980's, Reebok International Ltd. developed a self inflatingshoe which is disclosed in U.S. Pat. No. 5,893,219 (“the '219 patent”),which is incorporated herein by reference. Later Reebok InternationalLtd. introduced a shoe known as the PUMP FURY shoe which utilizes aninflatable exoskeleton to support the upper of a shoe. This shoe isdescribed in U.S. Pat. No. 6,237,251, the disclosure of which isincorporated herein by reference. One of the problems associated withtechnologically advanced shoes such as the one described in the '219patent is how to manufacture such shoes at a reasonable cost with as fewparts and as little weight as possible.

Accordingly, what is needed is a shoe which includes one continuouslyfluidly interconnected inflatable bladder, wherein fluid may flowbetween the underside of the foot to the medial and lateral sides of thefoot. The footwear must be securely fitted and fastened to the foot ofthe wearer, whereby a comfortable but secure grip is assured around theankle and around the instep of the wearer. Further, the bladder in theathletic shoe must be lightweight, inexpensive, self-contained, and easyto use. In addition, the shoe should be easily constructed with minimumrequired stitching.

BRIEF SUMMARY OF THE INVENTION

The present invention is generally an article of footwear having a sole,and an upper. The upper has an outer surface and an inner surface. Atleast a portion of either the outer surface or the inner surface or bothis formed from an inflatable bladder. The bladder is inflated by aninflation mechanism. The inflation mechanism is located in such a mannerthat the downward pressure of a user's foot causes the operation of theinflation mechanism. The bladder may be made from two sheets of urethanefilm which are welded together. Alternatively, the bladder can be formedfrom a polyester film, such as MYLAR®, or a laminate, such as a film andcloth laminate.

One inflatable bladder includes a sole compartment, a medialcompartment, and a lateral compartment. The sole compartment extendsunder the foot of a wearer and is further divided into at least a firstcompartment and a second compartment. The first compartment is fluidlyconnected and adjacent to the medial compartment and the secondcompartment is fluidly connected to and adjacent the lateralcompartment, such that the medial side and lateral side of the bladderare attached under the foot of the wearer. However, the firstcompartment and the second compartment are not directly fluidlyconnected and are separated by a periphery weld line. The firstcompartment and the second compartment are permanently attached underthe foot, such as by the use of stitching in the margin of the bladder.Consequently, the bladder forms a continuous cushion running from oneside of an inserted foot, under the foot, to a second side of the foot.

This bladder further includes a heel portion fluidly connected andadjacent to both the medial compartment and the lateral compartment. Theheel portion is permanently attached to the sole compartment, such thatthe bladder forms a boot surrounding a heel of a foot when it isinserted into a shoe.

The first compartment generally includes an arch compartment, while thesecond compartment generally includes a heel compartment. The secondcompartment also includes a midfoot compartment, which may be fluidlyconnected to one of the heel compartment, the medial compartment or thelateral compartment. The second compartment further includes a forefootcompartment, which may also be fluidly connected to one of the midfootcompartment, the medial compartment or the lateral compartment.

In another embodiment, the first compartment is a forefoot compartment,and the second compartment includes a heel compartment and a midfootcompartment, such that the midfoot compartment may be fluidly connectedto one or more of the heel compartment, the lateral compartment and themedial compartment.

An article of footwear of the present invention may include a releasevalve, which communicates between a bladder and the ambient atmosphere.With the release valve, a user can reduce the amount of air in a bladdermanually. Alternatively, an article of footwear may include a checkvalve, whereby the pressure in a bladder is automatically released. Inanother embodiment, a combination check valve and release valve may beused in the present invention. A combination check valve and releasevalve is made from a cap, a seating forming an air-tight seal with thecap, and a check valve forming another air-tight seal with the seating.Downward pressure on the cap causes a separation between the seating andthe cap releasing the airtight seal between the cap and the seating. Inanother embodiment, a check valve and a release valve may beside-by-side under the same cap, which is used to activate the releasevalve.

The underfoot inflation mechanism may define a hole which acts as aone-way valve to enable air to be introduced into said inflationmechanism. Generally, the inflation mechanism is located substantiallyunder the heel of the foot and includes a foam insert to help maintainthe volume of the inflation mechanism. More than one underfoot inflationmechanism may be used in the present invention. An underfoot inflationmechanism may be disposed within a cavity formed in the top surface of afoam midsole.

Air may be directed into an underfoot inflation mechanism from anoutside location through a tube. The tube has a first end in fluidconnection with the inflation mechanism and a second end open to theenvironment proximal to the article of footwear. The second end of thetube may have access to the environment via a plurality of substantiallyvertical holes, particular in a cover over the second end of the tube.The tube may be flexible or rigid.

In another embodiment, a shoe of the present invention may include avamp compartment, a medial heel compartment, and a heel compartment, inwhich the heel compartment is an underfoot inflation mechanism. In thisembodiment, vamp compartment may have a series of cross-hatched channelsformed by a plurality of openings defined by a plurality of interiorweld lines.

In another embodiment, one or more bladders may be fluidly connected toan underfoot inflation mechanism via a plurality of tubes. Each tube hasa first end fluidly connected to one or more bladders and a second endforming an air-tight seal with a channel that is fluidly connected tothe inflation mechanism located under the heel of the foot. The articleof footwear may include a shank supported by one or more sole pieces.The shank provides support to the shoe sole and bladder. The shank mayhave cavities that receive the tubes and direct them towards theunderfoot inflation mechanism. Tubes may also connect inflationmechanism to two bladders. Alternatively, tubes may connect an underfootinflation mechanism to a first bladder, while a separate tube connectsthe first bladder to a second bladder.

A shoe of the present invention may include an underfoot inflationmechanism that inflates a plurality of flexible tubes, that wheninflated tighten a conventional upper around a foot inserted therein.Tubes of a shoe of this embodiment have a first end and a second end,both of which form an air-tight seal with a channel that is fluidlyconnected to an underfoot inflation mechanism. Preferably, at least onetube extends across a vamp area of the article of footwear and at leastone tube extends across a heel area of the article of footwear.

The present invention is also directed toward an inflatable sockliner.The sockliner has a heel compartment that operates as an underfootinflation mechanism. The heel compartment of the sockliner may befluidly connected to several compartments including at least one medialcompartment, at least one forefoot compartment, at least one big toecompartment, at least one toe compartment and at least one lateralcompartment, defined by a periphery weld line and one or more interiorweld lines. The inflatable sockliner also includes a deflationmechanism. Preferably, the deflation mechanism is at least oneperforation that opens when pressure within the sockliner reaches apredetermined amount.

BRIEF DESCRIPTION OF THE DRAWINGS/FIGURES

The foregoing and other features and advantages of the present inventionwill be apparent from the following, more particular description of apreferred embodiment of the invention, as illustrated in theaccompanying drawings.

FIG. 1 is a lateral side of a shoe incorporating the present invention.

FIG. 2 is a top view of a bladder of the present invention.

FIG. 3 is a top view of an alternate embodiment of the bladder.

FIG. 4 is a top view showing the stitching of the bladder of FIG. 2 or3.

FIG. 5 is a top view of an alternate embodiment of the bladder.

FIG. 6 is a top view showing the stitching of a bladder of FIG. 5.

FIG. 7 a is an exploded view of the spring mechanism of a blow offvalve. FIG. 7 b is an exploded view of a combination check valve andrelease valve. FIG. 7 c is a cross section of a combination releasevalve and check valve. FIG. 7 d is a cross section of a combinationrelease valve and check valve with the release valve function operating.

FIG. 8 a is cross-sectional view of another combination check valve andrelease valve of the present invention. FIG. 8 b is a detailed view of acircled portion of FIG. 8 a.

FIG. 9 is a cross-sectional view of the combination check valve andrelease valve of FIG. 8 a, when the release valve is activated.

FIG. 10 is a perspective view of a cap of the combination check valveand release valve of FIGS. 8 a, 8 b and 9.

FIG. 11 a is an above plan view of another combination check valve andrelease valve of the present invention. FIG. 11 b is a schematiccross-sectional view of the combination check valve and release valve ofFIG. 11 a.

FIG. 12 is an exploded perspective view of a snorkel assembly of thepresent invention.

FIG. 13 is a lateral side view of an embodiment of the presentinvention.

FIG. 14 is an above plan view of a bladder of the present invention.

FIG. 15 is an above plan view of an alternative bladder of the presentinvention.

FIG. 16 is an above plan view of an alternative bladder of the presentinvention.

FIG. 17 is a lateral side of a shoe of the present invention.

FIG. 18 is a lateral side view of an embodiment of the presentinvention.

FIG. 19 a is an above plan view of a heel compartment assembly of thepresent invention. FIG. 19 b is a side plan view of the heel compartmentassembly of FIG. 19 a.

FIG. 20 is a lateral side view of another embodiment of the presentinvention.

FIG. 21 is an exploded perspective view of another embodiment of thepresent invention.

FIG. 22 is a lateral side view of another embodiment of the presentinvention.

FIG. 23 is an above plan view of an inflatable sockliner of the presentinvention.

DETAILED DESCRIPTION OF THE INVENTION

A preferred embodiment of the present invention is now described withreference to the Figures, in which like reference numerals are generallyused to indicate identical or functionally similar elements. Also in theFigures, the left most digit of each reference numeral generallycorresponds to the Figure in which the reference numeral first appears.While specific configurations and arrangements are discussed, it shouldbe understood that this is done for illustrative purposes only. A personskilled in the relevant art will recognize that other configurations andarrangements can be used without departing from the spirit and scope ofthe invention. It will be apparent to a person skilled in the relevantart that this invention can also be employed in other applications.

A shoe for a right foot according to the present invention is showngenerally at 100 in FIG. 1. A corresponding shoe for the left foot couldbe a mirror image of shoe 100 and therefore, is not shown or describedherein. As shown in FIG. 1, shoe 100 has a heel area shown generally at108, an arch area shown generally at 103, a vamp area shown generally at105, a forefoot area shown generally at 104, and a medial side areagenerally shown at 106. The present invention does not necessitate aconventional leather or cloth upper, particularly with the additionalfoam padding found along the interior of a typical athletic shoe upper.Therefore, shoe 100 includes a sole 120 and an upper 110 of which atleast a portion entirely comprises an inflatable bladder 130. Inaddition, upper 110 of FIG. 1 has a toe portion 134. As demonstrated inFIG. 1, toe portion 134 need not be constructed from bladder 130.However, in alternative embodiments, bladder 130 may form any or allportions of upper 110, including toe portion 134. Upper 110 has anopening shown generally at 112, which is designed to receive a wearer'sfoot.

In order for a wearer to customize the amount of air in the bladder atany time, bladder 130 is in communication with an inflation mechanism.In an embodiment shown in FIG. 1, a generic inflation mechanism 140 isattached to bladder 130 in the heel area of the shoe. However, inalternate embodiments, inflation mechanism 140 may be located on thetongue of the shoe, on the sole of the shoe, on the side of the shoe, orany other area of the shoe as would be apparent to one skilled in therelevant art. For example, another embodiment comprising an inflationmechanism on the tongue will be later discusses with reference to FIG.2.

A variety of different inflation mechanisms can be utilized in thepresent invention. The inflation mechanism may be, for example, a simplelatex bulb which is physically attached to the shoe. Alternatively, theinflation mechanism may be a molded plastic chamber as shown in FIG. 1or may be a hand held pump such as one which utilizes CO₂ gas to inflatea bladder.

Finally, as will be described with reference to FIG. 3 and FIG. 5, aportion of the bladder can be isolated from the remainder of thebladder. This isolated portion fluidly communicates with the remainderof the bladder via a one-way valve. This one-way valve allows theisolated portion to act as an inflation mechanism. Having an isolatedportion of the bladder act as an inflation mechanism is preferablysuitable for an underfoot bladder so as to automatically inflate thebladder as a user engaged in activity. However such an inflationmechanism may be used on any portion of the shoe.

Preferably, the inflation mechanism is small, lightweight, and providesa sufficient volume of air such that only little effort is needed foradequate inflation. For example, U.S. Pat. No. 5,987,779, which isincorporated by reference, describes an inflation mechanism comprising abulb (of various shapes) with a one-way check valve. When the bulb iscompressed air within the bulb is forced into the desired region. As thebulb is released, the check valve opens because of the pressure void inthe bulb, allowing ambient air to enter the bulb.

Another inflation mechanism, also described in U.S. Pat. No. 5,987,779,incorporated herein by reference, is a bulb having a hole which acts asa one-way valve. A finger can be placed over the hole in the bulb uponcompression. Therefore, the air is not permitted to escape through thehole and is forced into the desired location. When the finger isremoved, ambient air is allowed to enter through the hole. An inflationmechanism having collapsible walls in order to displace a greater volumeof air may be preferred. A similar inflation mechanism may include atemporarily collapsible foam insert. This foam insert ensures that whenthe bulb is released, the bulb expands to the natural volume of the foaminsert drawing in air to fill that volume. A preferred foam is apolyurethane, such as the 4.25–4.79 pound per cubic foot polyetherpolyurethane foam, part number FS-170-450TN, available from WoodbridgeFoam Fabricating, 1120-T Judd Rd., Chattanooga, Tenn., 37406.

U.S. Pat. No. 6,287,225, incorporated herein by reference, describesanother type of on-board inflation mechanism suitable for the presentinvention. One skilled in the art can appreciate that a variety ofinflation mechanisms are suitable for the present invention. Inaddition, any inflation mechanism is appropriate for use with anyembodiments of the present invention.

The inflation mechanism shown in FIG. 1 is an accordion style inflationmechanism comprising a plastic, collapsible case. Air enters through ahole open to the exterior of the inflation mechanism. The inflationmechanism operates similar to that described above with respect to thebulb inflation mechanism except that the casing is collapsedaccordion-style to increase the amount of air forced into the system.Upon release, the accordion-style casing expands and the air is forcedinto the casing to regulate the pressure within the casing.

These inflation mechanisms all require a one-way valve be placed betweenthe inflation mechanism and the bladder 130, so that once air enters thesystem it may not travel backwards into the inflation mechanism. Varioustypes of one-way valves are suitable for use in conjunction with thevarious inflation mechanisms of the present invention. Preferably, thevalve will be relatively small and flat for less bulkiness. U.S. Pat.No. 5,144,708 to Pekar, incorporated herein by reference, describes avalve suitable for the present invention. The patent describes a valveformed between thermoplastic sheets. The valve described in the Pekarpatent allows for simple construction techniques to be used whereby thevalve can be built into the system at the same time the bladder is beingwelded. One skilled in the art would understand that a variety ofsuitable valves are contemplated in the present invention.

The one-way valve provides a method to avoid over inflation of thesystem. In particular, if the pressure in the bladder is equal to thepressure exerted by the inflation mechanism, no additional air will beallowed to enter the system. In fact, when an equilibrium is reachedbetween the pressure in the bladder and the pressure of the compressedinflation mechanism, the one-way valve which opens to allow air movementfrom the inflation mechanism to the bladder 130 may remain closed. Evenif this valve does open, no more air will enter the system. Further, oneskilled in the art can design a pump to have a certain pressure outputto limit the amount of air that can be pumped into bladder 130. Anyone-way valve will provide a similar effect, as would be known to oneskilled in the art. In addition, any one-way valve would be appropriatefor use in any embodiments of the present invention.

One embodiment, as seen in FIG. 1, may include a deflation valve 109.The particular deflation valve in FIG. 1 is a release valve. A releasevalve is fluidly connected to bladder 130 and allows the user topersonally adjust the amount of air inserted into bladder 130,particularly if the preferred comfort level is less than the pressurelimits otherwise provided by the bladder. The release valve can compriseany type of release valve. One type of release valve is the plunger-typedescribed in U.S. Pat. No. 5,987,779, incorporated herein by reference,wherein the air is released upon depression of a plunger which pushes aseal away from the wall of the bladder allowing air to escape. Inparticular, a release valve may have a spring which biases a plunger ina closed position. A flange around the periphery of the plunger can keepair from escaping between the plunger and a release fitting because theflange is biased in the closed position and in contact with the releasefitting. To release air from bladder 130, the plunger is depressed bythe user. Air then escapes around the stem of the plunger. This type ofrelease valve is mechanically simple and light weight. The components ofa release valve may be made out of a number of different materialsincluding plastic or metal. Any release valve is appropriate for use inany embodiment of the present invention.

FIG. 1 shows one possible location of deflation valve 109 on shoe 100.However deflation valve 109 may be positioned in any number of differentlocations provided that it is fluidly connected with bladder 130, aswould be apparent to one skilled in the relevant art. Additionally, shoe100 may include more than one deflation valve.

As an alternative, deflation valve 109 may also be a check valve, orblow off valve, which will open when the pressure in bladder 130 is ator greater than a predetermined level. In each of these situations,bladder 130 will not inflate over a certain amount no matter how much auser attempts to inflate the shoe.

One type of check valve has a spring holding a movable seating memberagainst an opening in the bladder. When the pressure from the air insidethe bladder causes a greater pressure on the movable seating member inone direction than the spring causes in the other direction, the movableseating member moves away from the opening allowing air to escape thebladder. Another type of check valve is an umbrella valve, such as theVA-3497 Umbrella Check Valve (Part No. VL1682-104) made of SiliconeVL1001M12 and commercially available from Vernay Laboratories, Inc.(Yellow Springs, Ohio, USA). In addition, any other check valve isappropriate for use in the present invention, as would be apparent toone skilled in the art. Further, any check valve would be appropriatefor use in any of embodiments of the present invention.

In another embodiment, deflation valve 109 may be adjustable check valvewherein a user can adjust the pressure at which a valve is released. Anadjustable check valve has the added benefit of being set to anindividually preferred pressure rather than a factory predeterminedpressure. An adjustable check valve may be similar to the spring andmovable seating member configuration described in the precedingparagraph. To make it adjustable, however, the valve may have amechanism for increasing or decreasing the tension in the spring, suchthat more or less air pressure, respectively, would be required toovercome the force of the spring and move the movable seating memberaway from the opening in the bladder. However, any type of adjustablecheck valve is appropriate for use in the present invention, as would beapparent to one skilled in the art, and any adjustable check valve wouldbe appropriate for use in any embodiment of the present invention.

Bladder 130 may include more than one type of deflation valve 109. Forexample, bladder 130 may include both a check valve and a release valve.Alternatively, bladder 130 may contain a deflation valve 109 which is acombination release valve and check valve. This type of valve isdescribed in detail below with respect to FIGS. 7 a–7 d.

In one embodiment, small perforations may be formed in the bladder toallow air to naturally diffuse through the bladder when a predeterminedpressure is reached. The material used to make bladder 130 may be of aflexible material such that these perforations will generally remainclosed. If the pressure in the bladder becomes greater than apredetermined pressure the force on the sides of the bladder will openthe perforation and air will escape. When the pressure in bladder 130 isless than this predetermined pressure, air will escape very slowly, ifat all, from these perforations. Any embodiment of a bladder of thepresent invention may also have these perforations for controlling theamount of air within the bladder.

Bladder 130 may be formed from an exterior layer or film and acoextensive interior layer or film. The bladder may be shaped in avariety of configuration, such as that shown for bladder 230 in FIG. 2.The interior and exterior layers may be a lightweight urethane film suchas is available from J. P. Stevens & Co., Inc., Northampton, Mass. asproduct designation MP1880. Alternatively, the layers may be thin filmsof ethyl vinyl acetate or a similar barrier film. The interior layer andthe exterior layer may also be formed from different materials. Inaddition, the exterior layer may be a laminate formed from thecombination of a urethane film and a thin fabric attached thereto.

The interior layer is attached to the exterior layer along air-tightperiphery weld lines 210. The periphery weld lines 210 attach theexterior layer to the interior layer and create a barrier to keep airbetween the layers. One example of a suitable method of attachment ofthe exterior layer to the interior layer is the application of highradio frequency (RF welding) to the edges of the first and second film.The exterior and interior layers may alternatively be heat welded orultrasonic welded together or attached by any other air tight means.Interior weld lines 220 are also provided. These interior welded lines220 are also formed by RF welding, heat welding, ultrasonic welding orby other suitable means, and form the compartments of the presentinvention discussed in detail below. The exterior layer and interiorlayer are only attached along the periphery weld lines 210 and theinterior weld lines 220. Consequently, a pocket or bladder is formedwhich allows a fluid, such as air, another gas or a liquid, to beintroduced between the exterior layer and the interior layer. The sheetsare welded together along all the weld lines and then die cut to formthe predetermined shape. Alternatively, bladder 130 may be formed byblow molding, extrusion, injection molding and sealing, vacuum formingor any other thermoforming process using a thermoplastic material.

Since bladder 130 forms at least a portion of an exterior and/or aninterior surface of upper 110, as seen in an embodiment of FIG. 1, abladder of the present invention may also be formed with a thin layer ofexternal material bonded or laminated to one or both of the exterior andinterior layers. The bonding can occur either before or after theformation of the bladder. One suitable material is LYCRA® (availablefrom DuPont). LYCRA® is a flexible and breathable material.Alternatively, one or both of the exterior and interior layers may bebonded to a foam laminate, any type of synthetic material, or any othermaterial that would be available to one skilled in the art, or that istypically used in the production of a shoe. In a preferred embodiment,the bladder with or without the bonded material forms a portion of boththe exterior and the interior of the shoe.

Returning to FIG. 2, bladder 230 includes a plurality of compartmentsincluding medial compartment 254, lateral compartment 256, medial heelcompartment 259, lateral heel compartment 258, and sole compartmentsdesignated arch compartment 252, heel compartment 260, midfootcompartment 262 and forefoot compartment 264. Those compartmentsdisposed on the medial side of the shoe are fluidly connected to thosecompartments disposed on the lateral side of the shoe via fluidconnection junction 274 located in the achilleas tendon portion of theshoe. In the embodiment shown in FIG. 2, inflation mechanism 208 isfluidly connected to medial compartment 254 and fluidly connected viapassageway 272 to the medial heel compartment 259. Medial compartment254 provides cushioning to the medial side of the foot and is fluidlyinterconnected to arch compartment 252 which provides cushioning underthe arch of the foot. Medial compartment 254 is also fluidly connectedto medial heel compartment 259 via passageway 276 and to lateral heelcompartment 258 via connection junction 274, providing cushioning aroundheel area 108. Lateral heel compartment 258 is fluidly connected tolateral compartment 256 via passageway 278 which provides cushioningalong the lateral side of the foot.

Lateral compartment 256 is fluidly connected to heel compartment 260which provides cushioning to the heel of the foot. Heel compartment 260is also fluidly connected to connection junction 274 through passageway280. Heel compartment 260 is fluidly interconnected to midfootcompartment 262 and forefoot compartment 264.

As shown in FIG. 2, medial compartment 254, lateral compartment 256,midfoot compartment 262, lateral heel compartment 258, and medial heelcompartment 259 are further compartmentalized. This allows shoe 100 andbladder 230 to easily flex and further conform to a user's foot.

The bladder shown in FIG. 2 provides cushioning and a custom fit to theentire foot, including the sides of the foot. This increases the comfortof the wearer. Further, because the compartments located on the sides ofthe foot are fluidly connected to the different compartments locatedunderneath the foot, air can flow to both sides of the shoe when thecompartments located underneath the foot are under compression. Althoughbladder 230 is shown with lateral compartment 256 being fluidlyconnected to heel compartment 260 and medial compartment 254 beingfluidly connected to arch compartment 252, it would be apparent to oneskilled in the relevant art that any of the compartments located alongthe side and heel of the foot could be fluidly connected to any one ofthe compartments located beneath the foot to allow air to transfer fromthe bottom of the shoe to the sides of the shoe and vice versa.Furthermore, in alternate embodiments bladder 230 could include fewer orgreater numbers of compartments, and the compartments of bladder 230 maybe another size or shape, as would be apparent to one skilled in therelevant art.

In a preferred embodiment, bladder 230 may include welds 270, such asthose shown in forefoot compartment 264, heel compartment 260 and archcompartment 252. Welds 270 are used to control the thickness of thebladder when the bladder is in its filled configuration (e.g., air hasbeen pumped into the bladder). Welds 270 are also formed by RF welding,heat welding, ultrasonic welding or by other suitable means. In regionsof the bladder where it is desirable to have bladder 230 inflated to aminimal thickness, the density of circular welds 270 may be greater thanthe areas where it is permissible or desirable for bladder 130 to beinflated to a greater thickness. These welds may be circular or anyother geometry, such as triangular, oval or square, provided that theyare shaped to limit and control the inflation dimensions of the bladderof the present invention.

As shown in FIG. 2, deflation valve 109 may be located in lateralcompartment 256 of bladder 230, and inflation mechanism 208 may befluidly connected to medial compartment 254. However, in alternateembodiments, inflation mechanism 208 and deflation valve 109 may belocated in any area of bladder 230, which would be apparent to oneskilled in the relevant art, or absent altogether. FIG. 2 shows anelongated inflation mechanism, which may fit more conveniently along atongue portion of a shoe than a rounded bulb or an accordion styleinflation mechanism. As stated earlier, any type of inflation mechanismis suitable for use in the present invention, as would be clear to oneskilled in the art. Similarly all types of deflation valves described,above, with reference to bladder 130 may be used in an embodiment suchas bladder 230. Bladder 230 may also use perforations or one-way valvesto control the amount of air in bladder 230, as described above.

FIG. 3 shows an alternate embodiment of a bladder 330, wherein heelcompartment 308 acts as an inflation mechanism under the heel area ofthe foot. A hole may be located in heel compartment 308 so that, witheach step that is taken, the hole is sealed shut and the air located inheel compartment 308 is forced through one-way valve 320 into lateralcompartment 356 and on through the rest of bladder 330. The downwardpressure from the heel against the hole creates an air tight seal sothat the air in heel compartment 308 is forced through the one-wayvalve. One-way valve 320 will allow fluid to flow only in the directionopposite the direction of the arrow in FIG. 3. As the gait cyclecontinues, the heel of the foot rises releasing the pressure on heelcompartment 308 and removing the seal covering the hole. Air, preferablyfrom inside the shoe or alternatively from a tube directed outside ofthe shoe, is forced through the hole to equalize the pressure in heelcompartment 308. Consequently, a inflating mechanism is created thatconsistently provides air to bladder 330 with each step. Alternatively,a butterfly valve could be used instead of a hole. One example isdisclosed in U.S. Pat. No. 5,372,487 to Pekar, the disclosure of whichis incorporated by reference.

Also, as an alternative, heel compartment 308 may include a collapsiblefoam insert generally equivalent to the volume of heel compartment 308.The heel of the foot compressed the foam insert and heel compartment 308in a typical gait cycle. As the heel is released, the foam insertexpands to its original shape expanding the volume of the heelcompartment 308 and allowing air to enter with the expansion of the heelcompartment 308. A further example of a heel compartment comprising afoam insert is describe in detail below with respect to FIG. 5.

Lateral compartment 356 is further fluidly connected to midfootcompartment 362 through passageway 322, and forefoot compartment 364 isfluidly connected to lateral compartment 356 through one-way valve 380.

FIG. 3 shows a second inflation mechanism in forefoot compartment 364.This inflation mechanism is designed to work the same as the inflationmechanism discussed above for the heel compartment 308. In thisembodiment, air is forced into lateral compartment 356 through one-wayvalve 380 as the forefoot rolls onto forefoot compartment 364. Air isallowed to enter forefoot compartment 364 via a hole as discussed aboveor via a valve as described above. Also, forefoot compartment 364 maycomprise a foam insert, as described above for heel compartment 308. Inother words, the shoe of FIG. 3 utilizes two inflation mechanisms, whichtogether decrease the time it takes to inflate the bladder. By using twoinflation mechanisms, one in the heel and one in the forefoot, a userbegins to feel the shoe inflating in only a few steps.

In FIG. 3, both the forefoot compartment 364 and the heel compartment308 are shown to inflate the bladder. It should be understood that as analternative, the forefoot compartment 364 could be orientated to inflateone portion of the bladder while heel compartment 308 inflates anotherportion of the bladder. Weld lines can be utilized to isolate portion ofthe bladder to accomplish this result.

Lateral compartment 356 is fluidly connected to lateral heel compartment357 through fluid passageway 370. Lateral heel compartment 357 isfluidly connected to medial heel compartment 359 via fluid connectionjunction 358, providing support around the heel portion 108 of shoe 100.Medial heel compartment 359 is fluidly connected to medial compartment354 through fluid passageways 372 and 374. Medial compartment 354 isalso fluidly connected to arch compartment 352.

FIG. 3 shows that forefoot compartment 364, midfoot compartment 362,lateral compartment 356, medial compartment 354, lateral heelcompartment 357 and medial heel compartment 359 maybe furthercompartmentalized for the same purpose as the similar features of FIG.2. Also, the arch compartment 352 may have welds 270 similar to thosedescribed for FIG. 2.

Consequently, as a foot moves through a typical gait cycle, the pressurecaused by the foot to the various compartments located under the footforces the air into the various other fluidly connected parts of thebladder to provide added support around the medial side, lateral sideand heel of the foot.

The embodiment described in FIG. 3 may also have a deflation valve 109which opens bladder 330 to the atmosphere to reduce the amount of air inbladder 330. Bladder 330 may have a release valve, wherein theindividual wearer can release just the amount of pressure he or shedesires, a check valve, which opens only when the air pressure inbladder 330 reaches a predetermined pressure, or a combination thereofas described below with respect to FIGS. 7 a–7 d. Bladder 330 mayalternatively comprise an adjustable check valve, wherein the user canadjust the pressure at which the valve opens. Bladder 330 may have oneor more inflation mechanisms with a one-way valve which itself may actas a system to regulate the pressure, as described above with respect tothe embodiment of bladder 130.

In other embodiments, bladder 330 of the present invention may includeone or more manually operated inflation mechanisms located on the tongueof the shoe, near the heel of the shoe, on a lateral or medial side ofthe shoe, or anywhere else on the shoe as would be apparent to oneskilled in the relevant art.

In an embodiment as shown in FIG. 4, a bladder of the present invention,similar to those described in FIGS. 2 and 3, is stitched together by anS-shaped stitch 490 located under the foot of the wearer. This stitchingis placed in a stitching margin of periphery weld lines that are formedwhen the bladder is die cut. The stitching connects a portion of theperiphery weld of an arch compartment 252/352 against the periphery weldof the midfoot compartment 262/362 and heel compartment 260/308 to theperiphery weld disposed in area 408 below the fluid conjunctions 274,358, of FIGS. 2 and 3. Because the various compartments are sewntogether, the bladder of the present invention forms a boot whichcompletely surrounds the foot of the wearer. Because the components ofthe present invention are sewn together, the medial compartments 254,354, of FIGS. 2 and 3, and lateral compartment 256, 356, of FIGS. 2 and3, receive support from the other compartment. This support allows thebladder of the present invention to function as the upper itself.

Stitching is only one method for connecting these portions of thebladder. Alternatively, they may be adhered by glueing, bonding, RFwelding, heat welding, ultrasonic welding, or another other method knownto one skilled in the art.

In FIG. 5, another embodiment is described wherein a bladder 530 has analternative design. Bladder 530 includes a forefoot compartment 564,which is fluidly connected to lateral compartment 554 through fluidpassageway 512. Lateral compartment 554 is fluidly connected to fluidconnection junction 558 through fluid passageways 514 and 516. Lateralcompartment 554 and medial compartment 556 are fluidly connected acrossconnection junction 558, which cushions the heel of the foot. Fluidconnection junction 558 is fluidly-connected to medial compartment 556through fluid passageways 518 and 524. Medial compartment 556 is fluidlyconnected to midfoot compartment 562 through fluid passageway 522. Heelcompartment 508 is fluidly connected to midfoot compartment 562 throughone-way valve 520. The shape and size of each compartment may vary andmay be fluidly connected in any manner by the addition or removal ofvarious internal weld lines, as apparent to one skilled in the art.Further, alternative embodiments may have a greater or fewer number ofcompartments.

Each of lateral compartment 554 and medial compartment 556 may havepockets formed from internal weld lines which are not fluidly connectedto the rest of the compartment. Lateral pocket 532 is located withinlateral compartment 554 and medial pocket 534 is located within medialcompartment 556. These pockets are pre-inflated and are not part of theadjustable inflation system of the rest of the bladder. Further, bladder530 comprises a third pocket 528. This third pocket provides supportunder and along the lateral side of the foot and in heel area 108.Similarly, a fourth pocket 526 provides support to heel area 108.Pockets 528 and 526 may in fact not be inflated. Instead, the two layersremain flat against one another. The weld lines surrounding pockets 528and 526 keep the area separated from the inflated bladder without theneed to weld together the sheets of film in the interior of pockets 528and 526. Alternatively, lateral pockets 532 and medial pocket 534 couldbe removed leaving openings in the bladder at the locations designatedas 532 and 534.

Bladder 530 may include welds 270, such as those shown in forefootcompartment 564 and midfoot compartment 562. Welds 270 may be of anyshape provided that they limit and control the inflation dimensions ofthe bladder of the present invention. For example, elongated welds 540can be found in forefoot compartment 564, lateral compartment 554 andmedial compartment 540. Elongated welds 540 also define and limit theinflation dimensions of bladder 530.

Any inflation mechanism may be used as described for other embodimentsof the present invention. Preferred, however, is the use of heelcompartment 508 as an inflation mechanism. As can be seen in FIG. 5,heel compartment 508 includes a foam core 510. Foam core 510 is likely aconventional porous polyurethane foam, such as the 4.25–4.79 pound percubic foot polyether polyurethane foam, part number FS-170-450TN,available from Woodbridge Foam Fabricating, 1120-T Judd Rd.,Chattanooga, Tenn., 37406. As a user's heel steps down in a typical gaitcycle, heel compartment 508 and foam core 510 are compressed. The air inheel compartment 508 and foam core 510 is forced through one-way valve520, into midfoot compartment 562 and throughout the other fluidlyconnected compartments of bladder 530. As the user's heel rises, airenters heel compartment 508 through a hole or through a one-way valveopen to the atmosphere. The foam core 510 has a natural elasticity, suchthat the foam expands to its natural condition ensuring that heelcompartment 508 expands with it. Air enters and takes up the wholevolume of heel compartment 508.

Further, a shoe with an underfoot inflation mechanism may comprise asole with an indented recess, or cavity, (not shown) substantiallyadjacent to the inflation mechanism and substantially the shape of theinflation mechanism. When the shoe is constructed, the inflationmechanism is inserted into the indented recess. During a typical gaitcycle, the inflation mechanism is compressed between the indented recessand the foot such that the foot may sink into the indented recess. Theindented recess may be located in either an outsole or a midsole portionof the sole.

Bladder 530 may utilize perforations or the one-way valve as a techniquefor limiting the about of pressure build-up. Alternatively, deflationvalve 109 may be a release valve, check valve, a combination check valveand release valve (see below), or an adjustable check valve. Furthermore than one type of deflation valve 109 may be used. FIG. 5 shows onelocation for a generic deflation valve 109, however, a deflation valvemay be located on any portion of bladder 530.

In an embodiment as shown in FIG. 6, a bladder of the present invention,similar to that described in FIG. 5 is stitched together by an J-shapedstitch 690 located under the foot of the user. This stitching is placedin a stitching margin which is formed when the bladder is formed. Thestitching connects a portion of the periphery weld line around forefootcompartment 564 to the periphery weld line around midfoot compartment562 and third pocket 528 to the periphery weld line around midfootcompartment 562 and heel compartment 508, as seen in FIG. 5. Inaddition, the periphery weld line around heel compartment 508 isstitched to the periphery weld line adjacent to fourth pocket 526.Because the various compartments are sewn together, the bladder of thepresent invention forms a boot, which completely surrounds the foot ofthe wearer. The support of this boot allows the bladder of the presentinvention to function as the upper itself.

Stitching is only one method for constructing the bladder.Alternatively, periphery weld lines may be adhered by glueing, bonding,RF welding, heat welding, ultrasonic welding, or another other methodknown to one skilled in the art.

As discussed above, the present invention may include a combinationcheck valve and release valve. This combination check valve and releasevalve is depicted in FIGS. 7 a–7 d. The combination release valve andcheck valve 701 is made from sleeve 704, spring 702, base 706, umbrellavalve 708 and cap 710. FIG. 7 a shows an exploded view of how sleeve 704is supported in base 706. Sleeve 704 has a lip 712 which rest on spring702. Spring 702 fits into base 706. Sleeve 704 is preferably made ofaluminum to ensure a quality surface of lip 712. Alternatively, sleeve704 can be made from any number of plastic materials or other materialswhich would be known to one skilled in the art. Preferably, all thematerials in combination release valve and check valve 701 arelightweight. Spring 702 is preferably made from stainless steel but maybe made from a variety of metals or other materials.

FIG. 7 b is an exploded view of the entire combination release valve andcheck valve 701. Cap 710 has a surface portion 738 and a side portion740. Cap 710 and base 706 both may be formed from a molded plastic.Preferably, cap 710 and base 706 are formed from an injection-moldedresin. For example, cap 710 may be injection molded from Estane 58863(85A hardness), while base 706 may be injection molded from Bayer resin(60D hardness). Alternatively, cap 710 and base 706 may be injectionmolded from the same resin. Umbrella valve 708 sits through a hole 730in the bottom of sleeve 704, as shown in FIG. 7 a.

An assembled combination release valve and check valve 701 is shown inFIG. 7 c, wherein the release valve mechanism is not activated. Base 706is in contact with the bladder. Air enters the combination release valveand check valve 701 via a hole 720 in base 706 which is fluidlyconnected to the bladder of the present invention.

FIG. 7 c shows umbrella valve 708 having the general shape of anumbrella and forming an air-tight seal against sleeve 704. Theumbrella-shape is generally thick in the middle but forms a thin flap718 which rests and forms an air tight seal against sleeve 704. Air fromthe bladder travels through a first slot 722 located in the base of theumbrella valve 708 and through a second slot 724 located underneath theumbrella. Umbrella valve 708 is preferably made of a material which ismore rigid when thick and somewhat flexible when thin, such as silicone,so that thin flap 718 is somewhat elastic.

When the air pressure underneath the umbrella shape, and therefore thepressure in the bladder of the present invention, reaches apredetermined pressure, thin flap 718 is deformed and lifted off of thesleeve 704. Air is then allowed to escape through holes 716 in thesurface portion 738 of cap 710. Dotted line 728 shows the route of airthrough the release valve portion of combination release valve and checkvalve 701. When the air pressure in the bladder and under the umbrellabecomes less than the predetermined pressure, the thin flap 718 returnsto its natural shape an again creating a seal against sleeve 704. Thepreferred umbrella valve 708, commercially available as VA-3497 UmbrellaCheck Valve (Part No. VL1682-104) from Vernay Laboratories, Inc. (YellowSprings, Ohio, USA), typically deforms when the pressure in the bladderis around 5 pounds per square inch. Any other type of umbrella valve,however, would be suitable in the combination check valve and releasevalve of the present invention, as would be clear to one skilled in theart.

Spring 702, as seen in FIG. 7 c is in a slightly compressed state suchthat it holds sleeve 704 firmly and air-tightly against cap 710 so thatthe only air that may escape is through umbrella valve 704, as describeabove. In particular, an air tight seal is formed by the pressure of lip712 of sleeve 704 against a molded hinge 714 jutting from cap 710. Whenthe surface portion of cap 710 is pressed, cap 710 deforms, as can beseen in FIG. 7 d. When this occurs the surface portion 738 becomes flatpressing down on an upper rim 742 of sleeve 704. As sleeve 704 is forceddownward, spring 702 compresses and lip 712 is pulled away from hinge714. A gap 726 between hinge 714 and lip 712 allows air to escape outholes 716 in cap 710. Dotted line 729 shows the path of air flow whenthe release valve portion of combination release valve and check valveis activated.

In order to avoid a finger or thumb covering the holes located on thetop of cap 710 and preventing the air from escaping through holes 716,an embodiment may include an extension or wall sticking out from thesurface portion 738 of cap 710. For example, one embodiment may have aring-shaped wall (not shown) outside of the holes 716. The ring-shapedwall further has holes in the sides of the wall, such that when a fingeror thumb is placed on the ring-shaped wall, the wall pushes down on thecap 710 rather than the finger or thumb. The air that escapes throughholes 716 is still trapped by the finger or thumb from the top, but canescape through the holes in the sides of the ring-shaped wall. Anotherembodiment may have an extension sticking out from the center of surfaceportion 738. When the extension is depressed, the cap 710 depresseswithout covering the holes 716. An additional cap may be placed on topof the extension or wall to provide a bigger surface for a finger orthumb to depress the extension or wall. Consequently, the air is allowedto escape from a gap between cap 710 and the additional cap.

FIGS. 8 a, 8 b and 9 shows an alternative combination release valve andcheck valve 801. Combination release valve and check valve 801 is madefrom a base 806, umbrella valve 808 and cap 810. Therefore, combinationrelease valve and check valve 801 has less pieces and materials and istherefore preferred over combination release valve and check valve shownin FIG. 7. FIG. 8 a shows a cross section of base 806, umbrella valve808 and cap 810, wherein the release valve mechanism is not activated.FIG. 8 b is a detailed view of the portion of combination release valveand check valve 801 that is circled in FIG. 8 a. Wedge portion 844 isattached to side portion 840 by hinge portion 846. Preferably, cap 810and base 806 are formed from an injection-molded resin, similar to oneor more of those described above, with respect to combination releasevalve and check valve 701 of FIGS. 7 a–7 d. Cap 810 and base 806 may bemade from either the same resin or different resins.

Base portion 848 which is in contact with cap portion 842. Base portion848 and cap portion 842 form an air-tight seal. Preferably, this airtight seal is formed by glueing, bonding, RF welding, heat welding,ultrasonic welding, or another method known to one skilled in the art.Base 806 has a ledge 850 against which wedge portion 844 is pressed whencombination release valve and check valve 801 is not activated. Wedgeportion 844 and ledge 850 form an air tight seal.

Umbrella valve 808 sits through a hole 830 in base 806, as shown in FIG.8 a. Umbrella valve 808 has the general shape of an umbrella and formsan air-tight seal against a top surface 817 of ledge 850. Theumbrella-shape is generally thick in the middle but forms a thin flap818 which rests and forms an air tight seal against top surface 817 ofledge 850. Air from the bladder travels through a slot 822 located alongthe stem of the umbrella valve 808. Umbrella valve 808 is preferablymade of a material which is more rigid when thick and somewhat flexiblewhen thin, such as silicone, so that thin flap 818 is somewhat elastic.

When the air pressure underneath the umbrella shape, and therefore thepressure in the bladder of the present invention, reaches apredetermined pressure, thin flap 818 is deformed and lifted off of topsurface 817 of ledge 850, similar to the operation of the umbrella valve708 discussed above with respect to FIGS. 7 a–7 d. The air moves fromthe bladder to the atmosphere out a hole 816 in cap 810 along a dottedline 828. When the air pressure in the bladder and under the umbrellabecomes less than the predetermined pressure, the thin flap 818 returnsto its natural shape an again creating a seal against base 806. Thepreferred umbrella valve 708, discussed above with respect to FIGS. 7a–7 d is also the preferred umbrella valve 808 for the combinationrelease valve and check valve 801. Although, many other types ofumbrella valve are suitable, as would be clear to one skilled in theart.

One of cap portion 842 or base portion 848 is in contact with thebladder of the present invention depending upon how combination releasevalve and check valve 801 is integrated with the bladder, as would beapparent to one skilled in the art. Base 806 has holes 820, which allowair to pass from the bladder to an area 853 closed off by wedge portion844 and ledge 850, along dotted line 856. When the surface portion 838of cap 810 is pressed, cap 810 deforms, as can be seen in FIG. 9. Whenthis occurs, wedge portion 844 and surface portion 838 act like a lever,such that hinge 846 acts like a fulcrum moving wedge portion 844 awayfrom ledge 850. Dotted line 929 shows the path of air flow out of holes816 when the release valve portion of combination release valve andcheck valve 801 is activated.

In order to avoid a finger or thumb covering holes 816 located on thetop of cap 810 and preventing the air from escaping therethrough, holes816 may be recessed in cap 810, as shown in FIG. 10. Thus, when surfaceportion 838 is depressed, fingers do not actually come into contact withholes 816, and air can escape around the finger used to depress cap 810through channel 1027.

FIGS. 11 a and 11 b show yet another combination release valve and checkvalve 1101, which is a side-by-side valve. In this embodiment, aconventional release valve 1160 is placed side-by-side with an checkvalve 1108 under a cap 1110 comprising an exit hole 1116. Both checkvalve 1108 and release valve 1160 are embedded into a base 1106 whichcommunicates with the interior of a bladder. Exit hole 1116 may belocated anywhere within cap 1110 because both check valve 1108 andrelease valve 1160 create air-tight seals with base 1106. Thus, eitherair will exit out of exit hole 1116 in cap 1110, whether escaping fromthe check valve 1108 automatically due to pressure in the bladderexceeding a predetermined pressure or escaping from the release valve1160 due to manual operation thereof.

As seen in FIG. 11 b, which is a cross sectional view of combinationrelease valve and check vavle 1101, release valve 1160 may have aplunger 1120 and a spring 1122, similar to that described above.However, any release valve, such as those described above, may be usedin this embodiment. Similarly, check valve 1108 may be an umbrella valveas described above, with respect to FIGS. 7 a–7 d, or it may be anyother type of check valve 1108.

In other embodiments, combination release valve and check valves, suchas those described above, may incorporate an adjustable check valve,such as the adjustable check valve described above with respect to FIG.1, instead of the umbrella valves shown therein.

As discussed above, an underfoot inflation mechanism may be used in ashoe of the present invention. One way air may enter to the underfootinflation mechanism is through a hole in heel compartments 308 and 508,as discussed above with respect to FIGS. 3 and 5. Compression of heelcompartment 308, 508 seals the hole, such that air is forced intobladder 330, 530. However, sometimes, the materials used to make thesole are not sufficiently breathable to allow air contact to the hole.Further, moisture from the foot may enter into the hole causing damageto the inflation mechanism.

FIG. 12 shows a perspective exploded view of a snorkel assembly 1262.Snorkel assembly 1262 includes a valve chamber 1264, a tube 1266, acover 1268 and a sole component 1270. Valve chamber 1264 generally is athermoplastic unit that is adhered over a hole a heel compartment (suchas heel chamber 308, 508). Valve chamber 1264 includes a flat portion1265 that is directly adhered to an exterior or interior surface 1261 ofheel compartment 308, 508 via glueing, bonding, RF welding, heatwelding, ultrasonic welding, or another other method known to oneskilled in the art. Valve chamber 1264 also has a domed portion 1263.Domed portion 1263 is generally a half-cylinder shape with a closedfirst end 1267 and a second end 1269 comprising an opening 1271.

Since valve chamber 1264 inhibits a seal of the hole in heel chamber308, 508, valve chamber contains a one-way valve (not shown), such thatair will flow through valve chamber 1264 and into a heel chamber withoutflowing in the opposite direction (i.e., valve will not allow air toescape from a heel compartment. Any type of one-way valve, such as thosedescribed in detail above would be suitable for use in valve chamber1264. One such valve is a duckbill valve, wherein two flexible piecesform a funnel shape. The funnel shape has the two layers open on one endand pressed flat together on the other end, thus closing off the flatend. Air flows from the open end where the pressure is high to the flatend where the pressure is low, so that the flat end opens and the air isforced therethrough. Thus, air will flow in only one direction away fromthe increase in pressure.

Another duckbill valve uses four flexible pieces that come together toform a plus (+) shaped closed end rather than a flat (−) shaped closedend of the duckbill valve described above. The plus-shaped valve allowsfor greater flow therethrough when opened and does not make as muchnoise as when air flows through a flat-shaped duckbill valve.

Tube 1266 has a first end 1272 and a second end 1273. Tube 1266 isgenerally made of a thermoplastic material, such as thermoplasticurethane tubing. Tube 1266 may be rigid or flexible. First end 1272 oftube 1266 is inserted into opening 1271 in valve chamber 1264 and formsan air tight seal therewith. Tube has a generally J-shape and curvesalong the outside of a bladder (such as bladder 330, 530). Second end1273 is held against the outside of bladder by cover 1268. Cover 1268 isa thermoplastic formed piece having a flat portion 1274 and a domeportion 1275. Flat portion 1274 is adhered to the outside of the bladdervia glueing, bonding, RF welding, heat welding, ultrasonic welding, oranother other method known to one skilled in the art. Alternatively,cover 1268 may have a backing adhered to flat portion 1274 on a firstside and the outside of bladder on a second side. Preferably, flatportion 1274 is adhered to an outside of the upper in the generalvicinity of fluid connection junctions (such as fluid conjunctions 358and 558 of FIGS. 3 and 5, respectively), such as in heel area 108 ofFIG. 1. Dome portion 1275 is generally a half-cylinder shape with aclosed first end 1276 and a second end 1277 open to receive second end1273 of tube 1266. Cover 1268 also has one or more openings 1278 alongthe cylindrical part of dome portion 1275. Having openings 1278 on agenerally vertical part of the shoe allows air to enter dome portion1275, but keeps out dirt and moisture that may cause damage to theinflation mechanism.

Thus, when there is a low pressure inside a heel compartment, air willflow into heel chamber via snorkel assembly 1262. In particular, airwill flow into cover 1268 through openings 1278, through tube 1266 fromsecond end 1273 to first end 1272, through valve chamber 1264 and avalve housed therein and into a heel compartment. In another embodiment,second end 1273 of tube 1266 may have a butterfly valve or other valveinside cover 1268 for additional protection of the inflation mechanism.

Snorkel assembly 1262 also has a sole component 1270. Sole component1270 may be a midsole, an outsole, a thermoplastic plate or another partof a shoe sole, as are known to those skilled in the art. The solecomponent 1270 has a cavity 1280 therein. When sole component 1270 isadhered to a bladder, a heel compartment rests at least partially withincavity 1280. Cavity 1280 further has a recess 1282 into which valvechamber 1264 is inserted. Sole component 1270 also has a recess 1284into which tube 1266 is inserted when the shoe is assembled.

The snorkel assembly 1262 of the present invention is particularlydescribed with respect to heel compartments 308, 508 of FIGS. 3 and 5,respectively. However, one skilled in the art can appreciate thatsnorkel assembly 1262 is appropriate for use with any underfootinflation mechanism, such as those described with respect to furtherembodiments discussed below, or any other kind of inflation mechanism.

FIG. 13 show yet another embodiment of the present invention. Shoe 1300has a heel area shown generally at 1308, an arch area shown generally at1303, a vamp area shown generally at 1305, a forefoot area showngenerally at 1304, and a lateral side area generally shown at 1306. Shoe1300 also includes a sole 1320 and an upper 1310 of which at least aportion entirely comprises an inflatable bladder 1330. In addition,upper 1310 of FIG. 1 has a toe portion 1334. As demonstrated in FIG. 13,bladder 1330 may form all portions of upper 1310, including toe portion1334. Upper 1310 has an opening shown generally at 1312, which isdesigned to receive a wearer's foot.

Upper 1330 is formed from bladder 1330. Bladder 1330 is generally formedin the same manner described above with respect to the bladders of FIGS.2, 3 and 5. However, air flows through bladder 1330 within generallycross-hatched channels 1382 formed by generally diamond shaped openings1384 in bladder 1330. Openings 1384 are generally made in the same wayas pockets 532 and 534 as describe above with respect to FIG. 5. Inother words, interior weld lines 1386 are formed in a closed diamondshape and the material inside of interior weld line 1386 is removedforming an opening 1384. Openings 1384 are particularly useful forcooling and drying the foot as synthetic material, such as polyurethanefilms, may cause the foot to generate moisture in the shoe.

Bladder 1330 generally has a deflation mechanism 109, which may be anyof the deflation mechanisms discussed above, or another deflationmechanism that would be apparent to one skilled in the art. Further,bladder 1330 may have any type of inflation mechanism discussed above.Preferably, however, the inflation mechanism is an under foot inflationmechanism, similar to that described above with respect to FIGS. 3 and 5and discussed further with respect to FIGS. 14–16.

FIG. 14 is generally a top plan view of a bladder 1430 that is similarto bladder 1330 shown in FIG. 13. Bladder 1430 includes an interiorlayer and an exterior layer of a thin film that are attached by aperiphery weld line 1410 that surrounds bladder 1430. Bladder 1430 ofFIG. 14 is constructed by stitching, or otherwise attaching, a firstarea 1489 of periphery weld line 1410 to a second area 1490 of peripheryweld line 1410. Also, a third area 1491 of periphery weld line 1410 isstitched, or otherwise attached, to a fourth area 1492 of periphery weldline 1410 to form a left boot which surrounds most of the foot of thewearer. One skilled in the art can appreciate that a mirror image ofbladder 1430 may be used to form a right boot.

Bladder 1430 comprises a vamp compartment 1453, a medial heelcompartment 1458, and a heel compartment 1460. Vamp compartment 1453 isgenerally the largest compartment and provides cushioning to the medialside area 1488, vamp area 1305, lateral side area 1306 and a portion ofheel area 1308. Vamp compartment 1453 is fluidly connected to medialheel compartment 1458 via fluid connection junction 1474. Medial heelcompartment 1458 also provides cushioning to a portion of heel area 1308and is fluidly connected to heel compartment 1460 via fluid passageways1472 and 1473. Heel compartment 1460 provides cushioning to the heel ofthe foot and is preferably used as an inflation mechanism, as describedin detail with respect to FIGS. 3 and 5. Bladder 1430 also has adeflation mechanism 109, as shown in a location of vamp area 1305 inFIG. 14. As discussed above, deflation mechanism 109 may be anydeflation mechanism described above and may be located in any positionon bladder 1430.

Thus, in a typical gait cycle when the heel of the foot compresses heelcompartment 1460, air will move out of heel compartment 1460, through aone-way valve 1480 and fluid passageways 1472 and 1473 into medial heelchamber 1458. From medial heel chamber 1458 fluid will move throughfluid connection junction 1474 to inflate vamp compartment 1453. As airenters bladder 1430, the bladder may constrict around opening 1312,which operates as a closure for the shoe, such that laces, zippers, hookand pile or other closure system are not necessary.

As discussed above with respect to FIG. 13, vamp compartment 1453 andmedial heel compartment 1458 have openings 1384 formed by interior weldlines 1386. FIG. 14 shows only the approximate locations of interiorweld lines 1386. Openings 1384 can be of various sizes by makinginterior weld lines 1386 bigger or smaller in shape or by increasing ordecreasing the widths of interior weld lines 1386. In addition to sizes,the locations, numbers and shapes of openings 1384 may be varied.Openings 1384 are spaced such that the inflatable area between themforms cross-hatched channels 1382. Further, the width of periphery weldlines 1410 may be larger or smaller than that shown in FIG. 14.

Bladders 1330 and 1430 as shown in FIGS. 13 and 14, respectively, makeup almost all of upper 1310. However, FIGS. 15 and 16 show the top planviews of bladders 1530 and 1630 respectively that constitute a smallerportion of an upper. Thus, forefoot area 1304 is not covered by bladders1530 and 1630 when they are fully assembled into a shoe.

Vamp compartments 1553 and 1653, respectively, are shown in varioussizes. In particular, vamp compartment 1553 of bladder 1530 is smallerthan vamp compartment 1453 of bladder 1430. Thus, a shoe having bladder1530 has less of the upper made from a bladder than a shoe havingbladder 1430, as shown in FIG. 14. Similarly, vamp compartment 1653 ofbladder 1630 is smaller than vamp compartment 1553 of bladder 1530.Thus, a shoe have bladder 1630 has less of the upper made from a bladderthan a shoe having bladder 1530. However, medial heel compartment 1558,1658 and heel compartment 1560, 1660 if FIGS. 15 and 16 are similar tomedial heel compartment 1458 and heel compartment 1460 described abovewith respect to FIG. 14.

FIGS. 15 and 16 show the preferred width of the interior weld lines 1586and 1686, although interior weld lines 1586 may be a variety of widths,shapes and sizes.

FIG. 17 is a photograph of a lateral side of a shoe 1700 which has abladder 1730 similar to the bladder shown in FIG. 15. As discussedabove, bladders of the present invention may be made of thinpolyurethane film. The bladder in FIG. 17, however, is made from ametallized polyester film, such as MYLAR® (available from Dupont TeijinFilms, Wilmington, Del.) or another thin, light weight polyester film.MYLAR® is particularly suited to be used in a bladder of the presentinvention because it has great strength in a very thin film. Inaddition, polyester films, such as MYLAR® are air-tight, tear-resistantand puncture resistant. Further, polyester films may be printed,embossed, dyed, clear, colored or metallized, which provides a varietyof styles for a single shoe design. A bladder may be made from layers ofpolyester film has periphery and interior weld lines generally formed byheat sealing, or other such processes similar to those used in sealingpackages in the food industry and/or the MYLAR® balloon industry.However, weld lines may also be made using any other method of formingan air tight seal with a polyester film, as would be known to thoseskilled in the art.

Alternatively, the polyester film may be a composite of polyester filmand urethane filaments or a very thin layer of polyurethane film,particularly for the formation of air tight seals around inflation anddeflation mechanisms and components thereof. A polyester andpolyurethane composite also has increase tear-resistance with thebenefits of the lightweight nature of the polyester film.

Shoe 1700 is shown with openings 1784 cut inside interior weld lines1786 to allow air to circulate through the shoe. Although openings aregenerally diamond-shaped in FIGS. 13–17, openings may be circular,square, oval, or any other closed regular or irregular shape. Thus,interior weld lines that form openings 1384/1784 can have an equalvariety of shapes. In addition, openings 1384/1784 may vary in size andshape within various locations over the upper, as shown in FIGS. 13–17.

FIG. 18 shows another embodiment of the present invention in shoe 1800.FIG. 18 is a lateral view of shoe 1800. A medial side of shoe 1800 issimilar in form. Shoe 1800 has an upper 1810 that includes a firstbladder 1830 a and a second bladder 1830 b. First bladder 1830 a isgenerally located in a vamp area 1805, and second bladder 1830 b isgenerally located in a heel area 1808. A third bladder (not shown) is anunderfoot inflation mechanism located substantially under the heel, asdescribed above with respect to heel compartments 308, 508, 1460, 1560,and 1660 above. However, first and second bladders 1830 a and 1830 b arenot manufactured as a single unit with the heel compartment in theembodiment shown in FIG. 18. Instead, the heel compartment is fluidlyconnected with first bladder 1830 a via tubes 1890, and first bladder1830 a is fluidly connected with second bladder 1830 b via tube 1891. Inthe embodiment shown in FIG. 18, tube 1891 is redirected throughredirectional device 1892 between first and second bladders 1830 a and1830 b. Although not shown in FIG. 18, a medial side of shoe 1800 wouldhave tubes similar to tubes 1890 and 1891, such that the combination ofbladders 1830 a, 1830 b and tubes 1890 and 1891 form an opening 1812 fora foot.

As a typical gait cycle occurs, air flows from the heel compartmentthrough tubes 1890 into first bladder 1830 a and from first bladder 1830a to second bladder 1830 b through tube 1891. When inflated first andsecond bladders 1830 a and 1830 b close around an inserted foot suchthat laces or another closure system is not necessary.

Tubes 1890 and 1891 are fluidly connected to first and second bladders1830 a and 1830 b via tube connections 1894. Tube connectors 1894 arethermoplastic cases that are fluidly connected to a hole in first orsecond bladder 1830 a, 1830 b. The tube connectors 1894 have a flatportion 1865 that is directly adhered to an exterior or interior surfaceof bladders 1830 a and 1830 b, depending on how tube connectors areintegrated with bladders 1830 a and 1830 b as would be apparent to oneskilled in the art. Tube connectors 1894 may be adhered via glueing,bonding, RF welding, heat welding, ultrasonic welding, or another othermethod known to one skilled in the art, forming an air-tight sealtherewith. Tube connector 1894 also has a domed portion 1896. Domedportion 1896 is generally a half cylinder-shape with a closed first end1897 and a second end 1898 comprising an opening, into which tube 1890or tube 1891 is inserted. Tubes 1890 and 1891 and tube connectors 1894form an air-tight seal such that air cannot escape where tubes areconnected to first and second bladders 1830 a and 1830 b.

In an alternate embodiment, air may flow from the heel compartmentdirectly to second bladder 1830 b. For example, tube 1891 could be twotubes 1891 a and 1891 b which are each connected to the heelcompartment. Tubes 1890 and 1891 may be thermoplastic urethane or otherthermoplastic tubing, and may be flexible or inflexible. Tubes 1890extend into the sole 1820 of the shoe 1800. Shoe 1800 also includes ahard thermoplastic shank 1893, in which channels 1893 a have been formedto receive tubes 1890 and direct them towards the heel compartment, towhich they are fluidly connected under the foot of the wearer.

FIG. 18 also shows a tube 1866 and cover 1868 of a snorkel assembly,such as that described above with respect to FIG. 12, so that air canreach the heel compartment without a buildup of moisture in theinflation mechanism. Further, the embodiment of the present inventionshown in FIG. 18 may include any of the deflation devices discussedabove, e.g., one of the combination release valve and check valvedescribed above.

FIGS. 19 a and 19 b show one embodiment of a heel compartment assembly1901, suitable to be used in the sole 1820 of shoe 1800 of FIG. 18. Heelcompartment 1960 is fluidly connected to a plurality of tubes 1990through a channel 1999. Channel 1999 is fluidly connected to heelcompartment 1960 via a one way valve 1995. FIGS. 19 a and 19 b also showa valve chamber 1963 and a tube 1966 of a snorkel assembly 1962 asdescribed above with respect to FIG. 12. Channel 1999 and heelcompartment 1960 may be made by two or more layers of a flexiblepolyurethane film. Heel compartment 1960 may also comprise apolyurethane foam core, similar to that described above with respect toFIG. 5. Further, the embodiment of the present invention shown in FIG.19 may include any of the deflation devices discussed above, e.g., oneof the combination release valve and check valve described above.

Tubes 1990 are welded along with the film layers at a periphery weldline 1910 creating an air-tight seal around tubes 1990. Channel 1999further has welds 1970. Welds 1970 are used to control the thickness ofthe channel 1999 when air is moving through it, and they help direct theflow of air into tubes 1990. Periphery weld line 1910 and welds 1970 maybe formed by RF welding, heat welding, ultrasonic welding or by othersuitable means.

FIG. 20 shows another shoe 2000 of the present invention which also usesa heel compartment assembly as shown in FIGS. 19 a and 19 b. Shoe 2000is similar to shoe 1800, except that bladder 2030 is one piece. Bladder2030 is fluidly connected to tubes 2090 via tube connectors 2094. Tubeconnectors 2094 have flat portions 2065 that are directly adhered to anexterior or interior surface of bladder 2030 via glueing, bonding, RFwelding, heat welding, ultrasonic welding, or another other method knownto one skilled in the art, forming an air-tight seal therewith. Tubeconnectors 2094 also have domed portions 2096. Domed portions 2096 aregenerally a half-cylinder shape with a closed first end 2097 and asecond end 2098 comprising an opening, into which tube 2090 is inserted.Tubes 2090 and tube connector 2094 form an air-tight seal such that aircannot escape where tubes 2090 are connected to bladder 2030.

As a typical gait cycle occurs, air flows from the heel compartment (notshown) through tubes 2090 into bladder 2030. When inflated bladder 2030closes around an inserted foot such that laces or another closure systemis not necessary. Shoe 2000 also incorporates a shank 2093, which isformed with cavities 2093 a for receiving tubes 2090. Shank 2093 may bea molded thermoplastic piece, a shaped metal plate, a midsole foampiece, or another other structure that would be apparent to one skilledin the art. Tubes 2090 are fluidly connected with the heel compartmentunder the foot of the wearer, such as described above with respect toFIG. 19. Further, the embodiment of the present invention shown in FIG.18 may include a snorkel assembly, such as that described above withrespect to FIG. 12 and/or any of the deflation devices discussed above,e.g., one of the combination release valve and check valve describedabove.

Bladder 2030 may be connected to heel compartment via tubes 2090, asshown in FIG. 20. Alternatively, bladder 2030 and an underfoot inflationmechanism located either in the forefoot area or in the heel area may beformed as a unitary construction. One possible construction would besimilar to that of shoe 2100 shown in FIG. 21.

FIG. 21 shows an exploded view of a shoe construction of shoe 2100 ofthe present invention. Bladder 2130 has two underfoot sections, aforefoot compartment 2164 and a heel compartment 2160. Either forefootcompartment 2130 or heel compartment 2160 may be an inflation mechanism,preferably heel compartment 2160, for inflating the remainingcompartments of bladder 2130. Bladder 2130 is bonded to two outsolepieces 2120 a and 2120 b, via glueing or other type of adhesive. Outsolepiece 2120 a is bonded to heel compartment 2160, and outsole piece 2120b is bonded to forefoot compartment 2164. A portion of shank 2193 isbonded to both outsole pieces 2120 a and 2120 b and overlaps bladder2130. Shank 2193 is used to provide support between the outsole pieces2120 a and 2120 b.

An optional midsole 2155 may be included over bladder 2130. Midsole 2155may have indentations 2155 a which receive and may be bonded to theinterior of upper 2110. Additional, upper material (not shown) may bestitched to bladder 2130 and bonded to midsole 2155, particularly in toearea 2104. Additional material provides protection from the elements foran inserted foot where bladder 2130 does not cover the foot. Shoe 2100may also have a sockliner 2123 above the midsole or above shank 2193.Other parts of shoe 2100 not shown may include a snorkel assembly asdescribed with respect to FIG. 12, as well as other features thatprovide stability and protection to a wearer's foot.

FIG. 22 shows another shoe 2200 which incorporates the heel compartmentassembly 1901 shown and described with respect to FIGS. 19 a and 19 b asan underfoot inflation mechanism. Shoe 2200 comprises a conventionalupper 2210 and a plurality of flexible, inflatable tubes 2290. Wheninflated, tubes 2290 expand and close around an inserted foot asinflatable laces, such that conventional laces or another closure systemis not necessary. To remove shoe 2200 a deflation device (not shown) influid connection with tubes 2290, such as those discussed above, isactivated releasing air from and collapsing tubes 2290. The deflationdevice may be any of the deflation devices discussed above, e.g., one ofthe combination release valve and check valve. Tubes 2290 are fluidlyconnected to a channel 1999 (as shown in FIG. 19) at both ends, forminga loop over upper 2210. As the wearer applies pressure to a heelcompartment assembly, tubes 2290 inflate.

FIG. 22 shows five tubes 2290 extending across a vamp area 2205 of shoe2200 and three tubes 2290 extending across a heel area 2208. One skilledin the art can appreciate that more or less tubes 2290 may be used onshoe 2200. For example, shoe 2200 may have only one tube extend acrosseach of the vamp area 2205 and heel area 2208. Alternatively, shoe 2200may have no tubes in the heel area and only tubes in the vamp area, orvice-versa, provided that tubes 2290 when inflated help cushion andsecure a foot inside shoe 2200.

Shoe 2200 also has a shank 2293 with cavities 2293 a for receiving tubes2290. Shank 2293 provides shoe 2200 with support and structure. Shoe2200 may also have a covering layer of material (not shown) over tubes2290.

Each of the shoes described above may include a sockliner, such assockliner 2123 shown in FIG. 21. However, the same underfoot inflationmechanism described above may also be used in an inflatable sockliner.An overhead plan view of inflatable sockliner 2323 is shown in FIG. 23.Sockliner 2323 may also be made from two layers of a polyurethane filmbonded by glueing, bonding, RF welding, heat welding, ultrasonicwelding, or another other method known to one skilled in the art forforming an air-tight seal. Sockliner 2323 is generally defined by aperiphery weld line 2310 and includes various compartments defined byboth periphery weld line 2310 and various shaped interior weld lines2320.

Sockliner 2323 has a heel compartment 2360 with a hole 2361 allowing airto enter heel compartment 2360. When hole 2361 is covered, and pressureis applied to heel compartment 2360, air is forced through one-way valve2350 into a plurality of medial compartments 2354. Medial compartments2354 are fluidly connected to a plurality of forefoot compartments 2364.Forefoot compartments 2364 are fluidly connected to a plurality of firstphalanx compartments 2351 and a plurality of second through fifth phalaxcompartments 2353. Forefoot compartments 2364 are also fluidly connectedto a plurality of lateral compartments 2356. The various comparts shownin FIG. 23 are designed to have the general shape of the foot of thewearer. However, more or less compartment and alternatively shapedcompartments are suitable for a sockliner of the present invention.

Sockliner 2323 uses a perforation deflation mechanism described above.Preferably, sockliner 2323 has at least one perforation 2309, thelocation of which is shown in FIG. 23 by crossed lines. The materialused to make sockliner 2323 may be of a flexible material such thatperforation 2039 will generally remain closed. If the pressure in thesockliner 2323 becomes greater than a predetermined pressure the forceon the sides of the sockliner 2323 will open perforation 2309 and airwill escape. Since sockliner 2323 is inserted into the interior of ashoe, it will not be necessary for the wearer to have access to adeflation device within the shoe to avoid overinflation of sockliner2323. However, one skilled in the art can appreciate that anotherdeflation mechanism may be incorporated into sockliner 2323. Further,sockliner 2323 may have a snorkel assembly similar to that discussed inFIGS. 19 a and 19 b for introducing air into or out of sockliner 2323.

Sockliner 2323 may be removable or may be permanently inserted into theshoe during manufacture thereof. Further, sockliner 2323 may be used inany shoe of the present invention or in any conventional athletic,walking or hiking shoe or boot.

While the invention has been particularly shown and described withreference to preferred embodiments thereof, it will be understood bythose skilled in the art that they have been presented by way of exampleonly, and not limitation, and various changes in form and details can bemade therein without departing from the spirit and scope of theinvention. For example, any of the bladders of the present invention maybe pre-inflated at the factory. A bladder of this type would not requirean inflation mechanism or a deflation valve. Further, laces or anotherclosure system may be incorporated into any shoe design of the presentinvention.

Thus, the breadth and scope of the present invention should not belimited by any of the above-described exemplary embodiments, but shouldbe defined only in accordance with the following claims and theirequivalents. Additionally, all references cited herein, including issuedU.S. patents, or any other references, are each entirely incorporated byreference herein, including all data, tables, figures, and textpresented in the cited references.

The foregoing description of the specific embodiments will so fullyreveal the general nature of the invention that others can, by applyingknowledge within the skill of the art (including the contents of thereferences cited herein), readily modify and/or adapt for variousapplications such specific embodiments, without undue experimentation,without departing from the general concept of the present invention.Therefore, such adaptations and modifications are intended to be withinthe meaning and range of equivalents of the disclosed embodiments, basedon the teaching and guidance presented herein. It is to be understoodthat the phraseology or terminology herein is for the purpose ofdescription and not of limitation, such that the terminology orphraseology of the present specification is to be interpreted by theskilled artisan in light of the teachings and guidance presented herein,in combination with the knowledge of one of ordinary skill in the art.

1. An article of footwear comprising: a sole; an upper attached to saidsole, wherein at least a portion of said upper is formed by at least oneinflatable bladder; a first inflation mechanism disposed in a heelcompartment of said bladder and a second inflation mechanism disposed ina forefoot compartment of said bladder, wherein said first and secondinflation mechanisms are disposed in a location which allows operationof said inflation mechanisms by downward pressure of a wearer's foot. 2.The article of footwear of claim 1, wherein at least one of said firstand second inflation mechanisms is monolithic with said bladder.
 3. Thearticle of footwear of claim 2, wherein said first inflation mechanismand said second inflation mechanism are monolithic with said bladder. 4.The article of footwear of claim 1, wherein said first inflationmechanism inflates a first portion of said bladder and said secondinflation mechanism inflates a second portion of said bladder, whereinsaid first portion is isolated from said second portion.
 5. The articleof footwear of claim 1, further comprising an opening in said upper forinserting a wearer's foot, wherein said upper constricts around thewearer's foot when said bladder is inflated to operate as a closuresystem for said article of footwear and wherein said upper does not havean additional closure system for closing said upper around the wearer'sfoot.
 6. An article of footwear, comprising: an inflatable bladder; afirst inflation mechanism fluidly connected to said inflatable bladderand positioned to be actuated by the downward pressure of a wearer'sfoot; and a second inflation mechanism fluidly connected to saidinflatable bladder and positioned to be actuated by the downwardpressure of a wearer's foot, wherein said first and second inflationmechanisms are positioned above an upper surface of said sole.
 7. Thearticle of footwear of claim 6, wherein said first inflation mechanismis in a heel portion of said article of footwear.
 8. The article offootwear of claim 7, wherein said second inflation mechanism is in aforefoot portion of said article of footwear.
 9. The article of footwearof claim 6, wherein said first inflation mechanism is disposed in aforefoot portion of said article of footwear.
 10. The article offootwear of claim 6, wherein at least one of said first and said secondinflation mechanisms is monolithic with said bladder.
 11. The article offootwear of claim 10, wherein said first inflation mechanism and saidsecond inflation mechanism are monolithic with said bladder.
 12. Thearticle of footwear of claim 6, wherein said first inflation mechanisminflates a first portion of said bladder and said second inflationmechanism inflates a second portion of said bladder, wherein said firstportion is isolated from said second portion.
 13. The article offootwear of claim 6, further comprising a sole, wherein at least aportion of said bladder is disposed in said sole.
 14. The article offootwear of claim 6, further comprising an upper, wherein at least aportion of said bladder is disposed in said upper.
 15. The article offootwear of claim 6, wherein said article of footwear further comprisesa sockliner positioned between at least one of said first and secondinflation mechanisms and said wearer's foot.
 16. The article of footwearof claim 15, wherein said sockliner is removable.
 17. The article offootwear of claim 6, wherein at least one of said first and secondinflation mechanisms is disposed in a cavity formed in said uppersurface of said sole.
 18. The article of footwear of claim 6, whereinsaid sole further comprises a midsole and at least one of said first andsecond inflation mechanisms is disposed within a cavity formed in anupper surface of said midsole.
 19. The article of footwear of claim 18,wherein said midsole is a foam midsole.
 20. The article of footwear ofclaim 6, wherein said sole further comprises an outsole and at least oneof said first and second inflation mechanisms is disposed within acavity formed in an upper surface of said outsole.
 21. The article offootwear of claim 6, wherein said first and second inflation mechanismsare positioned on an upper surface of said sole.